Yes, and the plough is needed not only to produce that which is good, but to destroy that which is evil. There are diseases which, in the course of ages, wear themselves out, and do not appear again among men; and there may be forms of vice, which under changed circumstances, do not so much abound as they used to do; but human nature will always remain the same, and therefore there will always be plentiful crops of the weeds of sin in man's fields, and nothing can keep these under but spiritual husbandry, carried on by the Spirit of God. You cannot destroy weeds by exhortations, nor can you tear out the roots of sin from the soul by moral suasion; something sharper and more effectual must be brought to bear upon them. God must put his own right hand to the plough, or the hemlock of sin will never give place to the corn of holiness. Good is never spontaneous in unrenewed humanity, and evil is never cut up till the ploughshare of almighty grace is driven through it. The text leads our thoughts in this direction, and gives us practical guidance through asking the simple question, "Doth the ploughman plough all day to sow?" _This question may be answered in the affirmative_, "Yes, in the proper season he does plough all day to sow;" and, secondly, _this text may more properly be answered in the negative_, "No, the ploughman does not plough every day to sow; he has other work to do according to the season." I. First, our text may be ANSWERED IN THE AFFIRMATIVE--"Yes, the ploughman does plough all day to sow." When it is ploughing time he keeps on at it till his work is done; if it requires one day, or two days, or twenty days to finish his fields, he continues at his task while the weather permits. The perseverance of the ploughman is instructive, and it teaches us a double lesson. When the Lord comes to plough the heart of man he ploughs all day, and herein is his patience; and, secondly, so ought the Lord's servants to labor all day with men's hearts, and herein is our perseverance.